jonathan karl, abc news, sterling, virginia. >>> later this evening, virginia is set to execute a woman in a case that raises fundamental questions about who gets the delt pent and who does not. teresa lewis admits she's guilty. so, why are so many respected people saying this execution is wrong? jim sciutto is outside the prison in jarratt, virginia. >> reporter: teresa lewis has confessed to a crime, asking a lover and a friend to kill her husband and step-son to collect a $250,000 life insurance policy in a jailhouse interview with cnn, she pled for forgiveness. >> i just wish i could take it back. and i'm sorry for all the people that i've hurt. >> reporter: but complicating the case, lewis did not pull the trigger. the men who did only got life in prison. and court-appointed doctors found she only had an i.q. of 72, just two points above the legal minimum. a duke university psychologist who examined her concluded teresa's functional mental age is in the rage of 12 to 14 years. rallying to her cause are novelist john grisham, justices sonia sotomayor and ruth bader ginsburg, who vot